drbd: debugfs: add callback_history
Add a per-connection worker thread callback_history
with timing details, call site and callback function.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 30ed430..1a00001 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -697,6 +697,15 @@
cpumask_var_t cpu_mask;
};
+struct drbd_thread_timing_details
+{
+ unsigned long start_jif;
+ void *cb_addr;
+ const char *caller_fn;
+ unsigned int line;
+ unsigned int cb_nr;
+};
+
struct drbd_connection {
struct list_head connections;
struct drbd_resource *resource;
@@ -759,6 +768,12 @@
/* sender side */
struct drbd_work_queue sender_work;
+#define DRBD_THREAD_DETAILS_HIST 16
+ unsigned int w_cb_nr; /* keeps counting up */
+ unsigned int r_cb_nr; /* keeps counting up */
+ struct drbd_thread_timing_details w_timing_details[DRBD_THREAD_DETAILS_HIST];
+ struct drbd_thread_timing_details r_timing_details[DRBD_THREAD_DETAILS_HIST];
+
struct {
/* whether this sender thread
* has processed a single write yet. */
@@ -774,6 +789,17 @@
} send;
};
+void __update_timing_details(
+ struct drbd_thread_timing_details *tdp,
+ unsigned int *cb_nr,
+ void *cb,
+ const char *fn, const unsigned int line);
+
+#define update_worker_timing_details(c, cb) \
+ __update_timing_details(c->w_timing_details, &c->w_cb_nr, cb, __func__ , __LINE__ )
+#define update_receiver_timing_details(c, cb) \
+ __update_timing_details(c->r_timing_details, &c->r_cb_nr, cb, __func__ , __LINE__ )
+
struct submit_worker {
struct workqueue_struct *wq;
struct work_struct worker;
